Democrat Tom Suozzi won a special election for a U.S. House seat in New York on Tuesday, coming out on top in a politically mixed suburban district in a victory that could lift his party’s hopes heading into a fiercely contested presidential election later this year.

Suozzi defeated Republican Mazi Pilip to take the seat that was left vacant when George Santos, also a Republican, was expelled from Congress. The victory marks a return to Washington for Suozzi, who represented the district for three terms before giving it up to run, unsuccessfully, for governor.

It’s unclear how long his next stint on Capitol Hill will last, as a redistricting process unfolds that could reshape the district. But for now the result narrows the already slim Republican majority in the House. And it provides Democrats a much-needed win in New York City’s Long Island suburbs, where the GOP showed surprising strength in recent elections.